Curiosity got the better of me and I had a look through some other videos. Then I remembered there being some good shots of the astronauts in the Imagineering Story. It turns out this astronaut DOES have movement! You can see this at 33:41 in the second episode, What would Walt do? They begin to hoist the satellite into the air and the astronaut begins to pivot side to side. He is attached by his hand and moves back and forth. Looks to me that it's done in a similar way to the bigger satellite's moving arm.
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